Chapter 29 Review
... All stars, including the Sun, have the following identical composition: 1. 25 percent hydrogen; 73 percent helium; and 2 percent oxygen 2. 25 percent helium; 73 percent hydrogen; and 2 percent other 3. 25 percent helium; 73 percent hydrogen; and 2 percent oxygen 4. 25 percent hydrogen; 73 percent h ...
... All stars, including the Sun, have the following identical composition: 1. 25 percent hydrogen; 73 percent helium; and 2 percent oxygen 2. 25 percent helium; 73 percent hydrogen; and 2 percent other 3. 25 percent helium; 73 percent hydrogen; and 2 percent oxygen 4. 25 percent hydrogen; 73 percent h ...
The Sun
... At this point we need to notice that while the Earth rotates around the Sun at the same time the Sun rotates around its axis, so the period we observe from Earth is slightly larger than the true period, which we would observe if we were viewing the Sun from a distant star. In addition, the Sun i ...
... At this point we need to notice that while the Earth rotates around the Sun at the same time the Sun rotates around its axis, so the period we observe from Earth is slightly larger than the true period, which we would observe if we were viewing the Sun from a distant star. In addition, the Sun i ...
The Sun
... At this point we need to notice that while the Earth rotates around the Sun at the same time the Sun rotates around its axis, so the period we observe from Earth is slightly larger than the true period, which we would observe if we were viewing the Sun from a distant star. In addition, the Sun i ...
... At this point we need to notice that while the Earth rotates around the Sun at the same time the Sun rotates around its axis, so the period we observe from Earth is slightly larger than the true period, which we would observe if we were viewing the Sun from a distant star. In addition, the Sun i ...
Sun`s Exterior
... Typical sunspots are about the size of Earth. They appear dark because they are cooler: 5000 K. ...
... Typical sunspots are about the size of Earth. They appear dark because they are cooler: 5000 K. ...
Lecture 3a
... • There were many more stars • Venus had definite phases and was clearly orbiting the • Observed Saturn’s rings, but didn’t understand what they were • Observed sunspots on the sun, that the sun revolved on its own axis – wasn’t “perfect” and changed in unpredictable ways • Wrote book on Copern ...
... • There were many more stars • Venus had definite phases and was clearly orbiting the • Observed Saturn’s rings, but didn’t understand what they were • Observed sunspots on the sun, that the sun revolved on its own axis – wasn’t “perfect” and changed in unpredictable ways • Wrote book on Copern ...
"The Probability and Effects of an Asteroid Impact with Earth"
... surrounding the Sun where temperatures reach 12 million K, and where the solar wind originates. Sunspot cycle. The interval of ~11 years over which sunspot numbers increase and wane. Proton-proton chain. The sequence of nuclear reactions in which hydrogen nuclei (protons) interact and are fused to b ...
... surrounding the Sun where temperatures reach 12 million K, and where the solar wind originates. Sunspot cycle. The interval of ~11 years over which sunspot numbers increase and wane. Proton-proton chain. The sequence of nuclear reactions in which hydrogen nuclei (protons) interact and are fused to b ...
STARS AND PLANETS: A NEW SET OF MIDDLE SCHOOL
... the lifetimes of different masses of stars to each other and to the geologic timeline for the Earth. Students then make predictions about what classes of main sequence stars might have planets with interesting (as defined by the students) life forms, assuming the history of life on Earth is typical. ...
... the lifetimes of different masses of stars to each other and to the geologic timeline for the Earth. Students then make predictions about what classes of main sequence stars might have planets with interesting (as defined by the students) life forms, assuming the history of life on Earth is typical. ...
oct8
... 1000, 100-watt light bulbs. With about 6 billion people this would only be 6 1014 watts. We would need 670 billion more Earth’s doing the same thing to equal the energy output of the Sun. ...
... 1000, 100-watt light bulbs. With about 6 billion people this would only be 6 1014 watts. We would need 670 billion more Earth’s doing the same thing to equal the energy output of the Sun. ...
+ RA(*)
... FGC = ecliptic, with poles the north and south ecliptic poles, NEP and SEP. RP = vernal equinox γ. Co-ordinates: celestial (or ecliptic) longitude, λ = angle measured eastward from γ from 0º to 360. celestial (or ecliptic) latitude, β = angle measured from ecliptic. The system is useful for studies ...
... FGC = ecliptic, with poles the north and south ecliptic poles, NEP and SEP. RP = vernal equinox γ. Co-ordinates: celestial (or ecliptic) longitude, λ = angle measured eastward from γ from 0º to 360. celestial (or ecliptic) latitude, β = angle measured from ecliptic. The system is useful for studies ...
Big idea # 5 * Earth in space in time
... SC.8.E.5.1 Recognize that there are enormous distances between objects in space and apply our knowledge of light and space travel to understand this distance. SC.8.E.5.2 Recognize that the universe contains many billions of galaxies and that each galaxy contains many billions of stars. SC.8.E.5.3 Di ...
... SC.8.E.5.1 Recognize that there are enormous distances between objects in space and apply our knowledge of light and space travel to understand this distance. SC.8.E.5.2 Recognize that the universe contains many billions of galaxies and that each galaxy contains many billions of stars. SC.8.E.5.3 Di ...
Return both exam and scantron sheet when you
... (b) difference in speeds of the Earth and another planet in their orbits around the Sun. (c) planets stopping their eastward motion , moving westward awhile, and then resuming their eastward motion. (d) [None of the above.] 71. At the time of Copernicus, the fact that parallax shift of the brighter ...
... (b) difference in speeds of the Earth and another planet in their orbits around the Sun. (c) planets stopping their eastward motion , moving westward awhile, and then resuming their eastward motion. (d) [None of the above.] 71. At the time of Copernicus, the fact that parallax shift of the brighter ...
Our Solar System 6.1 Planets 6.2 Dwarf planets and other solar
... Read through the following passage. In space, most (90%) of all stars are actually double-star systems in which two stars orbit each other. This close orbit prohibits any planets from forming. Our solo star system gave way for planets to form. It is thought by astronomers that had the material that ...
... Read through the following passage. In space, most (90%) of all stars are actually double-star systems in which two stars orbit each other. This close orbit prohibits any planets from forming. Our solo star system gave way for planets to form. It is thought by astronomers that had the material that ...
conjunction and opposition
... Greatest elongation is the best time to view these inner planets as they will be seen at their furthest angular distance from the Sun, well away from a line of sight with the Sun. ...
... Greatest elongation is the best time to view these inner planets as they will be seen at their furthest angular distance from the Sun, well away from a line of sight with the Sun. ...
Compact Objects in the Solar System
... •! Planets may orbit the black hole or be flung from the Solar System. •! For two massive object interaction, lower mass objects will often be ejected. •! At first, people won’t notice too much, even though the orbit starts to change somewhat. ...
... •! Planets may orbit the black hole or be flung from the Solar System. •! For two massive object interaction, lower mass objects will often be ejected. •! At first, people won’t notice too much, even though the orbit starts to change somewhat. ...
The Sun
... • Sun converts 4 billion kg of matter to energy every second • Matter conversion = 1/140 of original mass • Sun converts 560 billion kg of H to He (5.6 x 1011 kg) every second • Mass of Sun: 2 x 1030 kg • 2 x 1030 kg/ 5.6 x 1011 kg/sec = 3.6 x 1018 sec = 114 billion years 2. The sun creates energy b ...
... • Sun converts 4 billion kg of matter to energy every second • Matter conversion = 1/140 of original mass • Sun converts 560 billion kg of H to He (5.6 x 1011 kg) every second • Mass of Sun: 2 x 1030 kg • 2 x 1030 kg/ 5.6 x 1011 kg/sec = 3.6 x 1018 sec = 114 billion years 2. The sun creates energy b ...
Stars
... in the core. A shell surrounding the core heats up enough to fuse H into He. Once He is used up, the core collapses again. Yet, for small stars, like the Sun, temperatures never reach the 600 million K needed to burn C. What stops the collapse? Electrons, which by Fermi’s law never occupy the same p ...
... in the core. A shell surrounding the core heats up enough to fuse H into He. Once He is used up, the core collapses again. Yet, for small stars, like the Sun, temperatures never reach the 600 million K needed to burn C. What stops the collapse? Electrons, which by Fermi’s law never occupy the same p ...
UNIT VIII/B: THE EARTH IN SPACE – STARS AND GALAXIES
... mass of the universe, but is not readily visible because it neither emits nor reflects electromagnetic radiation, such as light or radio signals. Its composition is unknown. It can be detected by its gravitational effect on objects in space. f. If we can determine the amount of matter in the univers ...
... mass of the universe, but is not readily visible because it neither emits nor reflects electromagnetic radiation, such as light or radio signals. Its composition is unknown. It can be detected by its gravitational effect on objects in space. f. If we can determine the amount of matter in the univers ...
Astronomical Constants
... 26) The sketch to the right shows the Moon in a certain phase. A) Name the phase of the Moon shown. __________ ___________ ...
... 26) The sketch to the right shows the Moon in a certain phase. A) Name the phase of the Moon shown. __________ ___________ ...
Some Important Introductory Concepts
... Kepler’s 3rd law, as modified by Newton (coming up), will be a cornerstone of much of this course, because it allows us to estimate masses of astronomical objects (e.g. masses of stars, galaxies, the existence of black holes and the mysterious “dark matter”). Example of use of Kepler’s 3rd law: Th ...
... Kepler’s 3rd law, as modified by Newton (coming up), will be a cornerstone of much of this course, because it allows us to estimate masses of astronomical objects (e.g. masses of stars, galaxies, the existence of black holes and the mysterious “dark matter”). Example of use of Kepler’s 3rd law: Th ...
Additional Exercises for Chapter 4 Computations of Copernicus and
... to Figure 4.33 and focus on the angular position α of Venus. Starting from α = 0, how many days does it take for Venus to revolve through the first 60◦ = π3 ? How many days for the second 60◦ = π3 , and how many for the third 60◦ = π3 ? Ans: 37.03 days; 74.48 − 37.03 = 37.45 days; 112.35 − 74.48 = 3 ...
... to Figure 4.33 and focus on the angular position α of Venus. Starting from α = 0, how many days does it take for Venus to revolve through the first 60◦ = π3 ? How many days for the second 60◦ = π3 , and how many for the third 60◦ = π3 ? Ans: 37.03 days; 74.48 − 37.03 = 37.45 days; 112.35 − 74.48 = 3 ...
AST 207 Test 1 28 September 2011
... 4. (3 pts.) Suppose a magician turned off the light of the sun. Would you see different stars at different times of the year? Explain. You would not see different stars at different times of the year. For example, on 9/21, you would not normally see Virgo because of the light of the sun. With the ma ...
... 4. (3 pts.) Suppose a magician turned off the light of the sun. Would you see different stars at different times of the year? Explain. You would not see different stars at different times of the year. For example, on 9/21, you would not normally see Virgo because of the light of the sun. With the ma ...
Reader`s Theater Our Closest Star
... strong enough to hold all of the parts of this system together. Is it any wonder the system is named after me? I am a star, your closest star. I may be millions of times closer to you than other stars, but I am still very far away. It would take a jet plane nineteen years to reach me. But, of course ...
... strong enough to hold all of the parts of this system together. Is it any wonder the system is named after me? I am a star, your closest star. I may be millions of times closer to you than other stars, but I am still very far away. It would take a jet plane nineteen years to reach me. But, of course ...
Solar System
The Solar System comprises the Sun and the planetary system that orbits it, either directly or indirectly. Of those objects that orbit the Sun directly, the largest eight are the planets, with the remainder being significantly smaller objects, such as dwarf planets and small Solar System bodies such as comets and asteroids. Of those that orbit the Sun indirectly, two are larger than the smallest planet.The Solar System formed 4.6 billion years ago from the gravitational collapse of a giant interstellar molecular cloud. The vast majority of the system's mass is in the Sun, with most of the remaining mass contained in Jupiter. The four smaller inner planets, Mercury, Venus, Earth and Mars, are terrestrial planets, being primarily composed of rock and metal. The four outer planets are giant planets, being substantially more massive than the terrestrials. The two largest, Jupiter and Saturn, are gas giants, being composed mainly of hydrogen and helium; the two outermost planets, Uranus and Neptune, are ice giants, being composed largely of substances with relatively high melting points compared with hydrogen and helium, called ices, such as water, ammonia and methane. All planets have almost circular orbits that lie within a nearly flat disc called the ecliptic.The Solar System also contains smaller objects. The asteroid belt, which lies between Mars and Jupiter, mostly contains objects composed, like the terrestrial planets, of rock and metal. Beyond Neptune's orbit lie the Kuiper belt and scattered disc, populations of trans-Neptunian objects composed mostly of ices, and beyond them a newly discovered population of sednoids. Within these populations are several dozen to possibly tens of thousands of objects large enough to have been rounded by their own gravity. Such objects are categorized as dwarf planets. Identified dwarf planets include the asteroid Ceres and the trans-Neptunian objects Pluto and Eris. In addition to these two regions, various other small-body populations, including comets, centaurs and interplanetary dust, freely travel between regions. Six of the planets, at least three of the dwarf planets, and many of the smaller bodies are orbited by natural satellites, usually termed ""moons"" after the Moon. Each of the outer planets is encircled by planetary rings of dust and other small objects.The solar wind, a stream of charged particles flowing outwards from the Sun, creates a bubble-like region in the interstellar medium known as the heliosphere. The heliopause is the point at which pressure from the solar wind is equal to the opposing pressure of interstellar wind; it extends out to the edge of the scattered disc. The Oort cloud, which is believed to be the source for long-period comets, may also exist at a distance roughly a thousand times further than the heliosphere. The Solar System is located in the Orion Arm, 26,000 light-years from the center of the Milky Way.